添加铌和钽对TiMoZr合金变形机制和拉伸性能的影响
Effect of Nb and Ta Addition on Deformation Mechanism and Tensile Properties of TiMoZr Alloys
摘 要
通过冷坩埚悬浮感应熔炼、轧制和固溶热处理制备Ti-8Mo-2Zr、Ti-8Mo-4Nb-2Zr和Ti-8Mo-4Nb-2Zr-2Ta（原子分数/%）钛合金，研究了铌和钽元素的添加对合金显微组织、拉伸性能和变形机制的影响。结果表明：3种合金的组成相均为单一β相，β相晶粒尺寸随着铌、铌+钽元素的添加逐步减小；Ti-8Mo-2Zr合金的变形机制以应力诱发α″马氏体相变和{332}孪生为主，而Ti-8Mo-4Nb-2Zr和Ti-8Mo-4Nb-2Zr-2Ta合金的变形机制以位错滑移为主；变形机制的转变导致合金强度的提高和塑性的降低，铌和钽元素添加产生的细晶强化和固溶强化效应进一步提高了合金的强度，Ti-8Mo-4Nb-2Zr-2Ta合金的抗拉强度高达970 MPa。
变形机制
拉伸性能
β-Ti alloy
deformation mechanism
tensile property
Abstract
Ti-8Mo-2Zr, Ti-8Mo-4Nb-2Zr and Ti-8Mo-4Nb-2Zr-2Ta (atom fraction/%) alloys were prepared by cold crucible induction levitation melting, rolling and solution treatment. The effects of Nb and Ta additions on the microstructure, tensile properties and deformation mechanism of the alloys were investigated. The results show that only one single β phase existed in all the three alloys. The β phase grain size decreased in turn with addition of Nb and Nb+Ta. Ti-8Mo-2Zr alloy deformed mainly by stress-induced α″ martensitic transformation and {332} twinning, while only dislocation slip appeared in the Ti-8Mo-4Nb-2Zr and Ti-8Mo-4Nb-2Zr-2Ta alloys. The change of deformation mechanisms led to the increase in alloy strength and decrease in ductility. The grain refinement strengthening effect and the solution strengthening effect produced by additions of Nb and Ta further improved the strength of the alloy; the tensile strength of the Ti-8Mo-4Nb-2Zr-2Ta alloy was as high as 970 MPa.
中图分类号 TG146.2 DOI 10.11973/jxgccl202201003
所属栏目 试验研究
基金项目 国家自然科学基金资助项目（51271107）；中国博士后科学基金资助项目（2019M661460）
收稿日期 2020/10/30
修改稿日期 2021/11/29
网络出版日期
作者单位点击查看
备注王敏(1988-),女,山东临沂人,讲师,博士
引用该论文: WANG Min,LU Liming,WANG Changhao,LI Qianli,YOU Jinglin. Effect of Nb and Ta Addition on Deformation Mechanism and Tensile Properties of TiMoZr Alloys[J]. Materials for mechancial engineering, 2022, 46(1): 14～18
王敏,LULiming,王长浩,李乾利,尤静林. 添加铌和钽对TiMoZr合金变形机制和拉伸性能的影响[J]. 机械工程材料, 2022, 46(1): 14～18
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【6】NAG S,BANERJEE R,FRASER H L.Microstructural evolution and strengthening mechanisms in Ti-Nb-Zr-Ta,Ti-Mo-Zr-Fe and Ti-15Mo biocompatible alloys[J].Materials Science and Engineering:C,2005,25(3):357-362.
【7】NIINOMI M,NAKAI M,HIEDA J.Development of new metallic alloys for biomedical applications[J].Acta Biomaterialia,2012,8(11):3888-3903.
【8】HO W F,JU C P,CHERN LIN J H.Structure and properties of cast binary Ti-Mo alloys[J].Biomaterials,1999,20(22):2115-2122.
【9】ALMEIDA A,GUPTA D,LOABLE C,et al.Laser-assisted synthesis of Ti-Mo alloys for biomedical applications[J].Materials Science and Engineering:C,2012,32(5):1190-1195.
【10】MIN X H,EMURA S,MENG F Q,et al.Mechanical twinning and dislocation slip multilayered deformation microstructures in β-type Ti-Mo base alloy[J].Scripta Materialia,2015,102:79-82.
【11】WANG C H,YANG C D,LIU M,et al.Martensitic microstructures and mechanical properties of as-quenched metastable β-type Ti-Mo alloys[J].Journal of Materials Science,2016,51(14):6886-6896.
【12】KURODA D,NIINOMI M,MORINAGA M,et al.Design and mechanical properties of new β type titanium alloys for implant materials[J].Materials Science and Engineering:A,1998,243(1/2):244-249.
【13】GAO J H,HUANG Y H,GUAN D K,et al.Deformation mechanisms in a metastable beta titanium twinning induced plasticity alloy with high yield strength and high strain hardening rate[J].Acta Materialia,2018,152:301-314.
【14】LAI M J,LI T,RAABE D.ω phase acts as a switch between dislocation channeling and joint twinning- and transformation-induced plasticity in a metastable β titanium alloy[J].Acta Materialia,2018,151:67-77.
【15】REN L,XIAO W L,KENT D,et al.Simultaneously enhanced strength and ductility in a metastable β-Ti alloy by stress-induced hierarchical twin structure[J].Scripta Materialia,2020,184:6-11.
【16】ZHANG J Y,FU Y Y,WU Y J,et al.Hierarchical {332} twinning in a metastable β Ti-alloy showing tolerance to strain localization[J].Materials Research Letters,2020,8(7):247-253.
【17】PAULING L. The nature of the chemical bond and the structure of molecules and crystals[M]. 3rd ed. New York:Cornell University Press,1960.
【18】LU J W,ZHAO Y Q,GE P,et al.Microstructure and beta grain growth behavior of Ti-Mo alloys solution treated[J].Materials Characterization,2013,84:105-111.
【19】HO W F.Effect of omega phase on mechanical properties of Ti-Mo alloys for biomedical applications[J].Journal of Medical and Biological Engineering,2008,28(1):47-51.
【20】BROZEK C,SUN F,VERMAUT P,et al.A β-titanium alloy with extra high strain-hardening rate:Design and mechanical properties[J].Scripta Materialia,2016,114:60-64.
【21】SUN F,ZHANG J Y,MARTELEUR M,et al.Investigation of early stage deformation mechanisms in a metastable β titanium alloy showing combined twinning-induced plasticity and transformation-induced plasticity effects[J].Acta Materialia,2013,61(17):6406-6417.
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